Desperate Ritual is a common Instant — Arcane card from Champions of Kamigawa (CHK), collector number 163. Current market price: $6.11 (foil $73.38), TCGplayer market prices via Scryfall.
Add {R}{R}{R}. Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)